function Base64() {
    // private property
    _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
    // public method for encoding
    this.encode = function (input) {
        var output = "";
        var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
        var i = 0;
        input = _utf8_encode(input);
        while (i < input.length) {
            chr1 = input.charCodeAt(i++);
            chr2 = input.charCodeAt(i++);
            chr3 = input.charCodeAt(i++);
            enc1 = chr1 >> 2;
            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
            enc4 = chr3 & 63;
            if (isNaN(chr2)) {
                enc3 = enc4 = 64;
            } else if (isNaN(chr3)) {
                enc4 = 64;
            }
            output = output +
                _keyStr.charAt(enc1) + _keyStr.charAt(enc2) +
                _keyStr.charAt(enc3) + _keyStr.charAt(enc4);
        }
        return output;
    }

    // public method for decoding
    this.decode = function (input) {
        var output = "";
        var chr1, chr2, chr3;
        var enc1, enc2, enc3, enc4;
        var i = 0;
        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
        while (i < input.length) {
            enc1 = _keyStr.indexOf(input.charAt(i++));
            enc2 = _keyStr.indexOf(input.charAt(i++));
            enc3 = _keyStr.indexOf(input.charAt(i++));
            enc4 = _keyStr.indexOf(input.charAt(i++));
            chr1 = (enc1 << 2) | (enc2 >> 4);
            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
            chr3 = ((enc3 & 3) << 6) | enc4;
            output = output + String.fromCharCode(chr1);
            if (enc3 != 64) {
                output = output + String.fromCharCode(chr2);
            }
            if (enc4 != 64) {
                output = output + String.fromCharCode(chr3);
            }
        }
        output = _utf8_decode(output);
        return output;
    }

    // private method for UTF-8 encoding
    _utf8_encode = function (string) {
        string = string.replace(/\r\n/g,"\n");
        var utftext = "";
        for (var n = 0; n < string.length; n++) {
            var c = string.charCodeAt(n);
            if (c < 128) {
                utftext += String.fromCharCode(c);
            } else if((c > 127) && (c < 2048)) {
                utftext += String.fromCharCode((c >> 6) | 192);
                utftext += String.fromCharCode((c & 63) | 128);
            } else {
                utftext += String.fromCharCode((c >> 12) | 224);
                utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                utftext += String.fromCharCode((c & 63) | 128);
            }
        }
        return utftext;
    }

    // private method for UTF-8 decoding
    _utf8_decode = function (utftext) {
        var string = "";
        var i = 0;
        var c = c1 = c2 = 0;
        while ( i < utftext.length ) {
            c = utftext.charCodeAt(i);
            if (c < 128) {
                string += String.fromCharCode(c);
                i++;
            } else if((c > 191) && (c < 224)) {
                c2 = utftext.charCodeAt(i+1);
                string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                i += 2;
            } else {
                c2 = utftext.charCodeAt(i+1);
                c3 = utftext.charCodeAt(i+2);
                string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                i += 3;
            }
        }
        return string;
    }
}

system = require('system'); // 获取参数
var jspath = system.args[0];
var base64JsonStr = system.args[1];
//将base64解密
var paramsJsonStr =  new Base64().decode(base64JsonStr) ;
//转换为json对象
var jsonObj = JSON.parse(paramsJsonStr);

var option = jsonObj.opt ;
var width = jsonObj.width ;
var height = jsonObj.height ;
var outfile = jsonObj.outfile ;
var fileSuffix = jsonObj.type ;
console.log(paramsJsonStr);

function Convert(params){
    this.params = params ;
    this.external = {
        JQUERY3 :  'jquery-3.4.1.min.js',
        ECHARTS3 : 'echarts.common.js'
    }; // 外部js
    this.page = require('webpage').create(); // 客户端
    this.page.onConsoleMessage = function(msg, lineNum, sourceId) {
        console.log('----console----'+msg);
    };
    var instance = this ;
    this.page.onError = function(msg, trace) {
        var msgStack = ['PHANTOM ERROR: ' + msg];
        if (trace && trace.length) {
            msgStack.push('TRACE:');
            trace.forEach(function(t) {
                msgStack.push(' -> ' + (t.file || t.sourceURL) + ': ' + t.line + (t.function ? ' (in function ' + t.function +')' : ''));
            });
        }
        console.error(msgStack.join('\n'));
        instance.output("", false, msg); // 失败,返回错误信息
    };
}

Convert.prototype.init = function(){
    var instance = this ;
    instance.page.open("about:blank", function(status) {
        // 注入依赖js包
        var hasJquery = instance.page.injectJs(instance.external.JQUERY3);
        console.log(hasJquery);
        var hasEchart = instance.page.injectJs(instance.external.ECHARTS3);
        console.log(hasEchart);
        // 检查js是否引用成功
        if (!hasJquery || !hasEchart) {
            instance.output("Could not found " + external.JQUERY3 + " or " + external.ECHARTS3, false);
        }
        // 创建echarts
        instance.page.evaluate(instance.createEchartsDom, instance.params);
        // 定义剪切范围，如果定义则截取全屏
        instance.page.clipRect = {
            top : 0,
            left : 0,
            width : instance.params.width,
            height : instance.params.height
        };
        // 渲染
        var result = instance.render();
        // 成功输出，返回图片或其他信息
        instance.output(result, true);
    });

}
Convert.prototype.render = function(){
    var instance = this ;
    switch (instance.params.type) {
        case 'file':
            // 渲染图片
            instance.page.render(instance.params.outfile);
            return instance.params.outfile;
        case 'base64':
        default:
            var base64 = instance.page.renderBase64('PNG');
            return base64;
    }
}

Convert.prototype.output = function(content, success, msg) {
    var instance = this ;
    console.log(1111111);
    console.log(success ? "[SUCCESS]:" : "[ERROR]:" + content);
    instance.page.close();
    instance.exit(instance.params); // exit
};

Convert.prototype.exit = function (params) {
    phantom.exit();
};

//
// 创建eCharts Dom层
// @param params 参数
//         params.opt
//     params.width
//     params.height
//     params.outfile
//     params.type = 'PNG'
//
Convert.prototype.createEchartsDom = function(params) {
    console.log("---createEchartsDom--"+params.width) ;
    var instance = this ;
    options =  params.opt ;
    // 动态加载js，获取options数据
    $('<script>')
        .attr('type', 'text/javascript') // .html('var options = ' + params.opt)
        .appendTo(document.head);
    // 取消动画,否则生成图片过快，会出现无数据
    if (options !== undefined) {
        options.animation = false;
    }
    // body背景设置为白色
    $(document.body).css('backgroundColor', 'white');
    // echarts容器
    var container = $("<div>")
        .attr('id', 'container')
        .css({
            width : params.width,
            height : params.height
        }).appendTo(document.body);

    var eChart = echarts.init(container[0]);
    console.log("options->>>>>"+JSON.stringify(options));
    eChart.setOption(options);
}

//构建,入口
new Convert(jsonObj).init();